# Trello + Slack integration > Automate Trello-to-Slack notifications and actions so your team always knows what's happening on every board. **Canonical page:** https://tray.ai/connectors/trello-slack-integrations/ **Trello connector:** https://tray.ai/connectors/trello-integrations/ **Trello documentation:** https://tray.ai/documentation/connectors/service/trello **Slack connector:** https://tray.ai/connectors/slack-integrations/ **Slack documentation:** https://tray.ai/documentation/connectors/service/slack ## Overview Trello and Slack are two of the most widely used tools on modern teams — one for managing work visually, the other for real-time communication. But when they operate separately, card updates get missed, teammates ask for status in the wrong channels, and projects lose momentum. Connecting Trello with Slack on tray.ai fixes that by automatically surfacing the right board activity in the right conversations. Most teams already live in Slack and plan in Trello, but keeping both in sync means constant manual work — copying card details into messages, pasting links to updates, remembering to announce a deadline change. That friction slows delivery and leaves half the team out of the loop. Connect Trello and Slack through tray.ai and you can trigger Slack messages the moment a Trello card moves to a new list, gets assigned to someone, or crosses a due date. You can also push data back into Trello from Slack, turning a channel reaction or slash command into a new card, checklist item, or label change. The result is a two-way sync that cuts duplicate communication, keeps stakeholders informed in real time, and gives your team one place to see what's actually happening. ## Use cases ### Real-Time Card Movement Notifications When a Trello card moves from one list to another — say, from 'In Progress' to 'Review' — a formatted Slack message goes out to the relevant project channel automatically. Team members know about status changes without leaving Slack to check the board, which means reviewers, approvers, and stakeholders are looped in the moment work advances. - Eliminates manual status update messages in team channels - Reduces context switching between Trello and Slack - Notifies reviewers immediately when work is ready ### Due Date and Overdue Card Alerts Automatically scan Trello boards on a schedule and send Slack alerts when cards are approaching or have passed their due dates. Notifications can go to a team channel or directly to the card's assigned member. Deadlines stop slipping quietly through the cracks. - Surfaces at-risk tasks before they become blockers - Sends direct deadline reminders to assignees - Reduces the need for manual project management check-ins ### New Card Creation from Slack Messages Team members can create Trello cards directly from Slack using a slash command, message action, or emoji reaction. The integration captures the message content, pulls out the relevant details, and creates a properly formatted Trello card in the right board and list. Ideas and action items get captured at the speed of conversation. - Converts Slack discussions into trackable Trello tasks instantly - Reduces action items that never make it onto the board - Keeps teams in their preferred communication tool ### Card Assignment Notifications to Individuals When a Trello card is assigned to a team member, a direct Slack message goes out automatically with the card details, board and list name, and a direct link. Assignees get immediate context without monitoring the board constantly. This is especially useful for cross-functional teams where members work across multiple boards. - Notifies assignees the moment they receive a task - Reduces the lag between assignment and acknowledgment - Provides direct links for faster task access ### Sprint or Board Summary Digests On a daily or weekly schedule, compile a summary of all Trello activity across a board — cards completed, cards added, overdue items, upcoming due dates — and post it as a structured Slack message to the team channel. This replaces manual standup prep and gives team leads a quick project health overview. Particularly useful for distributed or async teams. - Automates standup preparation and project reporting - Gives leadership a consistent cadence of project visibility - Reduces time spent generating status updates manually ### Checklist Completion Alerts Trigger a Slack notification when all items in a Trello card checklist are marked complete, signaling that the card is ready to move to the next stage. This is useful for multi-step tasks, QA processes, or approval workflows that depend on checklist sign-offs. The message can include the card link and a summary of completed items. - Automates hand-off signals between workflow stages - Removes dependency on manual checklist monitoring - Speeds up multi-step approval and review processes ### Customer Support Ticket Escalation When a Trello card in a support board is labeled 'High Priority' or moved to an escalation list, an alert goes out automatically to a dedicated Slack escalation channel and tags the relevant on-call team member. Urgent customer issues get immediate attention without anyone manually watching the board. Incident response times drop fast. - Accelerates response times for high-priority support issues - Gets the right people paged at the right moment - Creates a reliable escalation trail within Slack ## Templates ### Notify a Slack Channel When a Trello Card Moves to a New List This template monitors a Trello board for card movement events and automatically posts a formatted notification to a Slack channel, including the card name, the previous list, the new list, and a direct link to the card. Connectors used: Trello, Slack ### Create a Trello Card from a Slack Slash Command Lets team members type a slash command in any Slack channel to create a new Trello card instantly. The template parses the command input for card title, description, and list destination, creates the card in Trello, and replies with a confirmation and card link. Connectors used: Slack, Trello ### Send Daily Trello Board Digest to Slack Each morning, this template queries a Trello board for all activity from the past 24 hours — new cards, moved cards, completed cards — and compiles a structured digest posted to a Slack channel so the team starts the day with full project context. Connectors used: Trello, Slack ### DM a Trello Card Assignee in Slack When They Are Added to a Card When a member is added to a Trello card, this template looks up their Slack user and sends them a direct message with the card name, board, list, due date, and a link — so they know about new responsibilities right away. Connectors used: Trello, Slack ### Alert Slack When a Trello Card Becomes Overdue This template runs on a recurring schedule to check cards across one or more Trello boards for passed due dates. For each overdue card, it posts a Slack alert to the project channel and sends a direct message to the assigned member. Connectors used: Trello, Slack ### Post a Slack Message When a Trello Card Label Changes to High Priority Monitors Trello for label change events and sends an escalation Slack message to a designated alerts channel whenever a card receives a 'High Priority' or 'Urgent' label, including the card details and a direct link. Connectors used: Trello, Slack ## Challenges Tray.ai solves ### Mapping Trello Members to Slack Users Reliably Trello and Slack maintain separate user directories with no native link between them. When a card is assigned in Trello, there's no built-in way to identify the corresponding Slack user — especially on teams where display names or emails differ across platforms. **How Tray.ai helps:** tray.ai's data mapping and transformation tools let you build a lookup step that matches Trello member emails to Slack user IDs via the Slack API at runtime. For teams where email domains differ, you can also maintain a static mapping table within the workflow, so every assignment notification reaches the right person. ### Handling High-Volume Board Activity Without Noise Active Trello boards can generate dozens of events per hour. A Slack notification for every card update quickly overwhelms team channels, buries the alerts that actually matter, and trains people to ignore notifications altogether. **How Tray.ai helps:** tray.ai workflows include conditional logic and filtering steps so you can define exactly which events should trigger a Slack message. Filter by specific lists, labels, members, or event types, and implement rate-limiting or digest-style batching to group multiple updates into a single summary message. ### Keeping Slack Message Formats Consistent and Useful Raw Trello webhook payloads are nested JSON. Pass them directly to Slack and you get unreadable messages with no context, no formatting, and no actionable links — the kind of notification everyone learns to dismiss. **How Tray.ai helps:** tray.ai's built-in data transformation tools let you extract, reshape, and format any Trello webhook payload into rich Slack Block Kit messages with section headers, card links, member names, due dates, and action buttons — no custom formatting code required. ### Managing Multi-Board and Multi-Workspace Complexity Enterprise teams often run multiple Trello boards across different projects and multiple Slack workspaces across different departments. Building separate notification setups for each combination becomes unmanageable quickly. **How Tray.ai helps:** tray.ai supports parameterized, reusable workflow templates that deploy across multiple board-and-channel combinations from a single configuration. Centralized credential management means you authenticate Trello and Slack once and reuse those connections across every workflow, cutting maintenance overhead significantly. ### Avoiding Duplicate or Missed Notifications from Webhook Failures Trello webhooks can fail, time out, or deliver duplicate payloads during service interruptions. Without retry and deduplication logic, teams either miss notifications or get the same alert multiple times — both erode trust in the automation fast. **How Tray.ai helps:** tray.ai has built-in error handling, automatic retries with configurable backoff policies, and execution logs that make it easy to identify and replay failed runs. You can also add idempotency checks using a unique card action ID to make sure each Slack notification goes out exactly once. ## Learn more - Intelligent Integration: https://tray.ai/platform/intelligent-ipaas/ - Merlin Agent Builder: https://tray.ai/platform/merlin-agent-builder/ - Agent Gateway for MCP: https://tray.ai/platform/agent-gateway/ - Book a demo: https://tray.ai/contact/